Make LockeZ's Sacrifice script Blizzard Compatible

Code:
#==============================================================================

# ** Window_Skill

#------------------------------------------------------------------------------

#  This window displays usable skills on the skill and battle screens.

#==============================================================================



class Window_Skill < Window_Selectable

  #--------------------------------------------------------------------------

  # * Draw Item (Rewrite for HP costs.

  #     index : item number

  #--------------------------------------------------------------------------

  def draw_item(index)

    skill = @data[index]

    if @actor.skill_can_use?(skill.id)

      self.contents.font.color = normal_color

    else

      self.contents.font.color = disabled_color

    end

    x = 4 + index % 2 * (288 + 32)

    y = index / 2 * 32

    rect = Rect.new(x, y, self.width / @column_max - 32, 32)

    self.contents.fill_rect(rect, Color.new(0, 0, 0, 0))

    bitmap = RPG::Cache.icon(skill.icon_name)

    opacity = self.contents.font.color == normal_color ? 255 : 128

    self.contents.blt(x, y + 4, bitmap, Rect.new(0, 0, 24, 24), opacity)

    self.contents.draw_text(x + 28, y, 204, 32, skill.name, 0)

    #draw costs

    if LockeZ::HP_Sacrifice_Action['Skill'].include?(skill.id)

      self.contents.font.color = text_color(2) #hp in red.

      action = LockeZ::HP_Sacrifice_Action['Skill'][skill.id];

      if action[1] == 'integer'

        cost = action[2].to_i

        self.contents.draw_text(x + 232, y, 48, 32, cost.to_s, 2)

      elsif action[1] == 'percent'

        cost = action[2].to_i

        self.contents.draw_text(x + 232, y, 48, 32, cost.to_s + "%", 2)

      end

    else

      self.contents.draw_text(x + 232, y, 48, 32, skill.sp_cost.to_s, 2)

    end

  end

end